/*
 * Copyright (C) 2020 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.permissioncontroller.permission.service

import android.os.Looper
import androidx.lifecycle.LifecycleObserver
import androidx.lifecycle.LifecycleOwner
import androidx.lifecycle.LifecycleRegistry
import java.lang.IllegalStateException

class CheckLifecycleRegistry(provider: LifecycleOwner) : LifecycleRegistry(provider) {
    private val observerLock = Any()

    override fun addObserver(observer: LifecycleObserver) {
        if (Looper.myLooper() != Looper.getMainLooper()) {
            throw IllegalStateException("Lifecycle running on non main thread")
        }
        synchronized(observerLock) {
            super.addObserver(observer)
        }
    }

    override fun removeObserver(observer: LifecycleObserver) {
        if (Looper.myLooper() != Looper.getMainLooper()) {
            throw IllegalStateException("Lifecycle running on non main thread")
        }
        synchronized(observerLock) {
            super.removeObserver(observer)
        }
    }
}